squid vs ommastrephes

squid and ommastrephes both are nouns.

Word	Noun	Adjective	Verb	Adverb
squid	Yes	No	No	No
ommastrephes	Yes	No	No	No

As nouns, ommastrephes is a hyponym of squid; that is, ommastrephes is a word with a more specific, narrower meaning than squid:

squid: widely distributed fast-moving ten-armed cephalopod mollusk having a long tapered body with triangular tail fins
ommastrephes: extremely active cylindrical squid with short strong arms and large rhombic terminal fins

Other hyponyms of squid include loligo, architeuthis, giant squid.

squid (noun)	ommastrephes (noun)
widely distributed fast-moving ten-armed cephalopod mollusk having a long tapered body with triangular tail fins	extremely active cylindrical squid with short strong arms and large rhombic terminal fins
(Italian cuisine) squid prepared as food